Abstract: A process for desulfurizing waste gas is described, wherein an SO.sub.2 containing waste gas is absorbed in an aqueous solution and the resultant solution containing sulfite is treated electrolytically which is much less expensive than the prior art methods, is simpler to implement and avoids the danger of producing explosive gases which is possible in prior art methods based on anodic O.sub.2 formation and cathodic H.sub.2 formation. In this process, electrochemical oxidation of SO.sub.3.sup.2- ions into SO.sub.4.sup.2- ions occurs at the anode as well as a simultaneous formation of H.sup.+ ions, thereby producing H.sub.2 SO.sub.4, while avoiding the production of oxygen. Apparatus suitable for carrying out this process is also described.

Abstract: A method and apparatus for removing solid material from a process system pressurized by a process gas, especially process gases having a high content of solid material. The method operates cyclically. In a first cycle, the solid material is separated, via filter cartridges of sintered material, and accompanied by pressure-relief, practically completely from pressure-relieved gas in a pressurized receiving tank. In a second cycle, the solid material is removed from the receiving tank. In a third cycle, while simultaneously cleaning the filter cartridges of solid material adhering thereto, the receiving tank is pressurized. Finally, in a fourth cycle, solid material is removed from the process system. The apparatus includes a receiving tank, with at least two filter cartridges being provided on the gas outlet side thereof.

Abstract: A process for the dry sluicing of sediment from pressurized systems, such as gasification processes, in which gravitationally conveyed sediments are cooled to below their release temperature before removal. The sediments are cooled via indirect heat exchange, such as radiation cooling, to below their release point in a first zone, and are then further cooled indirectly as well as directly via cool countercurrent gas in a second zone to temperatures below 300.degree. C., the sediment route in the second zone being lengthened by deflection of at least a part of the sediment, the sediment being removed via a sluice.

Abstract: Fuel gas produced in a coal distillation or gasification plant 1 is fed to a power plant 5 and chlorine, fluorine, sulphur and compounds thereof in the fuel gas are separated from the fuel gas, and also from flue or exhaust gas emanating from the power plant, in two stages. In a first stage, chlorine and fluorine and their compounds are separated, preferably in the dry using alkali metal or alkaline earth metal oxides, hydroxides or carbonates, in a separator 3. In a second stage sulphur and its compounds, together with further chlorine, fluorine and their compounds, if any, produced in the power plant, are removed from the flue or exhaust gas from the power plant in a desulphurizing plant 6. This two stage process is thermally more efficient and less costly than a process in which the chlorine, fluorine sulphur and their compounds are all removed at once from the fuel gas.

Abstract: Treatment of waste water containing chlorides comprising treatment with Ca (OH).sub.2 or CaCO.sub.3 to convert the chlorides to CaCl.sub.2, adding sulfuric acid to said water in a reaction vessel to produce hydrochloric acid and gypsum, circulating the mixture in a closed cycle between the reaction vessel and a distillation column for the extractive distillation of the resulting hydrochloric acid, and filtering out the accumulating gypsum sludge from the treated waste water, wherein the added amount of waste water amount of hydrochloric acid correspond to the amount of sludge exiting the reaction vessel or the amount of distillate removed from the distilling column and the amount of gypsum separated, and the hydrochloric acid concentration in the liquid is less than the maximum azeotropic concentration for a mixture of H.sub.2 O and HCl.

Abstract: An anticorrison protected small electric household water heating tank includes a metal tank having a passive anticorrosive layer provided on an inner wall thereof. A U-shaped electric immersion heating element is horizontally arranged in a lower region of the tank. A pair of electrodes are supplied with external current, one being an external current anode horizontally arranged above and perpendicular to the arms of the U-shaped heating element and the other being the tank itself. A reference electrode is also provided in the lower region of the tank. A potentiostat is connected to the reference electrode and tank for detecting the potential between the reference electrode and tank, for comparing the detected potential between tank and reference electrode to a reference voltage and for adjusting the current flow to the external electrodes to maintain an optimum potential between the tank and reference electrode.

Abstract: A device for cathodic corrosion protection such as for hot water tanks having a passive anticorrosive layer on the inner wall of the tank. The cathodic corrosion protection employs the use of an external current anode. The device includes a holder which bears the external current anode and a reference electrode. The holder is adapted to be inserted into a single opening in the tank wall. A potentiostat employs the external current anode and reference electrode so as to establish a predetermined potential between reference electrode and the tank by regulating the current flowing through the external current anode to the tank. This provides the desired corrosion protection. Two embodiments of the device are described.